My gear s3 is running as a role of Gatt Server and I checked receiving and sending data is succeeded.

But how can I check connection state of Gatt server?

bt_gatt_set_connection_state_changed_cb is working when only gatt client.

Registered callback in bt_gatt_server_set_characteristic_notification_state_change_cb is called whenever gatt client notify or not.

But when gatt client is disconnected without ‘unnotify’ for some reasons(far away …), registered callback  is not called.

Please let me know if you know how to detect connection state.